Question

put two to three iron nails in the blue solution of copper of sulphate and 15 to 20 minutes the colour of the solution turns green​

Answer 1

Answer:

when we put iron nails in blue solution of copper sulphate after 15 to 20 minutes the blue colour of the solution fade and solution becomes pale green and iron nail turns brownish.

Explanation:

As iron is more reactive than copper so iron displacese copper from its solution and it's chemical equation is

Fe (s) + CuSO4 (aq) = FeSO4 + Cu

this reaction is called displacement reaction